Electric gas lamp



Jui 28, 192 5.

A. LEDERER ELECTRIC GAS LAMP Filed Aug I INVENTQR 4 AN TON LEDERER ATTORNEY Patented July 28 1925.

UNITED STATES PATENT OFFICE.

ANTON LEDERER, F VIENNA, AUSTRIA, ASSIGNOR TO WESTINGHOUSE LAMP COM- PANY, A CORPORATION OF PENNSYLVANIA.

ELECTRIC ens LAMP.

Application filed August 30, 1921. Serial No, 497,023.

To all whom it may concern:

Be it known that I, ANTON LEDERER, a

resident of Vienna, Austria,,have invented a new and useful Improvement in Electric Gas Lamps (for whichI have filed applications in Austria, September 15, 1913, Patent No. 74,395; Switzerland, January 6, 1921; Germany, January 7, 1921; England, January 10, 1921; France, January 10, 1921;

Holland, January 10, 1921; and Italy,-Jan-- uary 13, 1921), of which the following is a specification.

This invention relates to electric lamps,

and more particularly relates to electric lamps in which a gas or mixture of gases,

forms the light giving medium. An object of the invention is,to prevent V the gas from becoming excessively heated. A further and more specific object is to provide in an electric gas lamp such a construction of the constituent parts as will permit a continuous and self-acting renewal of the heated gas in the discharge tube by e acooler gas. These .and from the following detailed description.

It has been found desirable in the construction of electric gas lamps, because of current conditions therein, to confine the dimensions of the luminous tubes to narrow limits. However, as a result of such construction, the disadvantage arises, when the lamp is burning, of the as contained in the discharge tube quickly lleating to such an A extent as to endanger the constituent parts of the lamp and to shorten its life.

In order to obviate thesedifliculties, it is proposed by the present invention to so construct the-lamps that the discharge tube is placed in communication with another container, each of which is'filled with a gas. As a consequence of this construction, a circulation of the gas may take place and the t5 gas heated in the discharge tube may be continuously renewed by cooled gas from the other container. secured by narrowing or reducing the dimensionsofthe discharge tube in order to .10 effects. required radiation of light are preserved without any resultant injury to the ,An electric gas lamp embodying the feaother objects will be apparent Thus the advantages.

tures of the invention is illustrated in the l accompanying drawings in which citizen of the Republic of Austria, and a Fig. 1 is a vertical section showing the relative positions of the discharge tube and the other container; and

Fig. 2 is a horizontal section of the lamp taken on the line IIII of Fig. 1 illustrat- I I ing more clearly the communicating pa:-

sageways between the tubes.

Referring to the drawings, particularly Fig. 1, the lamp may consist of the two containers 3 and 4 which for the sake of convenience are illustrated as being one within the other. The outer envelope 3 may comprise a completely enclosed shell or envelope ottransparent material while the inner container, termed the discharge tube, 4 may consist of a narrow tube open at each of its ends and vertically supported in any desired manner in spaced relation from the outer lamp so that there is an intervening space 5 between these two members on all sides of the inner contalner.

Two electrodes -6 and 7 may be secured, by fusing or otherwise, in the openings at each end. of the inner tubes and may have connected therewith current conductors 8 and 9, respectively extending to any convenient source of electrical energy. The cross-section of the electrodes may be such as to not entirely fill the inner diameter of the discharge tube and for that purpose may be provided with two flattened sides 11 so that assageways 12 may be provided leading rom the inner tube to the space 5 between ,the inner and outer containers.

Both envelopes may be charged with a gas adapted to become luminous upon passage of a current of electricity therethrough and it is to be observed that upon heating of the gas within the discharge tube by passage of such current and cooling of the gas in the outer container, or envelope by reason of contact with the walls thereof, a circulation of the gas through the passageways 12 at the ends of the discharge tube is eflected whereby the heated gas will be continuously renewed by the cooler gas. Thus excessive heating of the gas which is detrimental to the burning and life of the lamp, is prevented;

Obviously, various modifications ma suggest themselves 'which will fall Within the within the discharge tube,

scope of the principle explained above and which come within the spirit of the invention as set forth in the appended claims. One of such modifications may comprise providing the discharge tube itself with perforations in its ends, while still another which might suggest itself is that of altering the shape or arrangement of the two envelopes provided the aforesaid gas circulation is maintained.

What is claimed is:

1. An electric gas lamp comprising two envelopes one within the other, the inner envelope comprising a discharge tube, a

gaseous filling for each of said envelopes,

electrodes secured in the ends of saiddischarge tube, spaces between said electrodes and the walls of said tube, whereby the gas in said discharge tube upon becoming heated may'circula-te from said tube through said spaces to the outer envelope, and the cooler gas in said outer envelope may pass through said spaces into said inner tube and take the place of the heated gas.

2. An electric gas lamp comprising a closed envelope, a discharge tube Within said envelope and spaced therefrom, a gas within said envelope of the character adapted to become luminous upon the passage of an electrical current therethrough, and solid electrodes within said envelope and disposed adjacent the ends of said discharge tube so as to confine the discharges taking place therebetween to the discharge tube, said electrodes also being so disposed with respect to the discharge tube as to permit the heated gas to emerge from one end and the cooled gas to pass through the other end thereof.

In testimony whereof, I have hereunto subscribed my name this 11th day of August,

ANTON LEDERER. 

